Electric-alarm thermometer.



PATENTED MAY 12, 1908.

W. WALTHBR. ELECTRIC ALARM THERMOMETER.

APPLICATION FILED MAR. 12. 1907.

UNITED STATES WILHELM WALTHER, OF HOMBURG, GERMANY,

ELECTRIC-ALARM THIERMOMETER.

Specification of'Letters Patent.

Patented May 12, 1908.

Application filed much 12, 1907. Serial No. 361,991.

To all whom it may concern:

Be it known that I, WILHELM WALTHER, a subject of the German Emperor,residing at 42 Kaiser Friedrichs Promenade, Hornburg, Germany,boarding-house proprietor, have invented a certain new and usefulElectric- Alarni Thermometer, of which the following is a specification.

This invention relates to an alarm thermometer used for indicating by anelectric signal when a certain temperature has been reached and isapplicable to hospitals, green houses and the like and which can also beem loyed as a fire alarm.

he'invention is illustrated in the accompanying drawing which is anelevation of a thermometer provided according to the invention.

In carrying out the invention I provide two or more platinum contacts awhich are fused into the mercury tube b'at various points for example at0 C. and 40. C as illustrated in the drawings. These contactswould beconnected u to one or'moreelectric circuits, in each of which circuitsan electric alarm device suchas a bell would be-provided.

It will be understood that on the mercury rising in the tube to thelevel of the u per contact the circuit through the electric a a m devicewould be completed. When the thermometer is intended for use as a firealarm the mercury tube is surrounded with wire gauze in order that thealarm may be rung before the glass tube melts or breaks.

What I claim as my invention and desire to secure by Letters Patent isAn electric alarm thermometer consisting in combination of a mercurytube, two or more platinum contacts soldered into said tube which serveto com lete one or more electric circuits in each 0 which an electricalarm device is provided, and a wire gauze shield which surrounds themercury tube.

In testimony whereof I have hereunto signed my name to thisspecification in the presence of two subscribing witnesses.

WILHELM WALTHER.

Witnesses CARL BUcnMi'ILLER, JEAN GRUND.

